Keselowski needs to finish 15th or better in Sunday's Ford EcoBoost 400 to claim his first NASCAR Sprint Cup championship over Johnson, who has five titles.

Much of the secondary interest in the 28-year-old native of Rochester Hills, Mich., surrounded his cellphone. Keselowski was docked $25,000 by NASCAR for having his phone in his car during Sunday's race at Phoenix but promised not to take it with him for the finale.

When asked if he felt naked without his phone, Keselowski laughed.

"Naked actually is very appropriate," he said. "I do feel naked when I don't have my phone. It's my security blanket. It doesn't matter how I feel about it right now. It is what it is at this point. I just have to move on and focus on the weekend ahead."

It wasn't the first time Keselowski had his phone in his car during a race. At the Daytona 500 in February, he tweeted and took photographs during a red flag after Juan Pablo Montoya's car struck a jet dryer full of fuel, igniting a huge blaze.

As a result of the in-car tweets, Keselowski now has more than 325,000 followers on Twitter. When asked if he was confused by the anti-phone ruling, Keselowski said, "I'm confused a lot. I'll just add that to the list.

"I think NASCAR has certainly said that they want to draw a line as to what you can do specifically in the car. I think that's what it means for the future."